Rhodia Operations

Energy Solutions (US) LLC

Solvay (China) Co., Ltd.

Rhodia (China) Co. Ltd.

Junli Li

Floryan De Campo

Tingting Zhang

Annelyse Murillo

Yong Yang

Pascal Metivier

Anne Mu

Gary Woodward

Provided are a process for preparing a flame retardant, a flame retardant obtained by the process and use of the flame retardant in a polymer composition.

Flame retardant and preparation process thereof

Disclosed is a process to produce a hypophosphite salt defined as [Chypophosphite] by reacting P4 with a hydroxide salt defined as [COH], or a hydroxide salt precursor and a catalyst, wherein Cis the cationic moiety of [Chypophosphite] salt.

Process for the production of hypophosphite salts

A process for stabilizing hypophosphite salt is provided, which comprises the following steps: a) washing the hypophosphite salt at least one time under a controlled pH value of 4-11, preferably 5-8, as the said hypophosphite salt in an aqueous solution and/or in a solid state; and b) drying the said hypophosphite salt under reduced pressure to remove the volatiles. The process can prevent or minimize the formation of a dangerous quantity of phosphine from hypophosphite salts, more particularly in the flame retardant of the application. The flame retardant polymer composition is also provided, which comprises a polymer and the hypophosphite salt stabilized by the above process.

Process for stabilizing hypophosphite

The current invention relates to a process for stabilizing a hypophosphite salt, comprising the step of heating the hypophosphite salt at a temperature of between 150 and 370&#xb0; C. during a sufficient period of time to prevent the formation of a dangerous quantity of phosphine in their application as FR in polymers and a flame retardant polymer composition comprising a polymer and 0.1 to 30 weight percent based on the total weight of the composition of the hypophosphite salt thermally stabilized by the above process.

Process for stabilizing hypophosphite salts

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Shanghai, China

Junli Li